16697431 has 4 divisors (see below), whose sum is σ = 16789864. Its totient is φ = 16605000.

The previous prime is 16697419. The next prime is 16697489. The reversal of 16697431 is 13479661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16697431 - 2¹⁵ = 16664663 is a prime.

It is a super-2 number, since 2×16697431² = 557608403999522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16691431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45945 + ... + 46306.

It is an arithmetic number, because the mean of its divisors is an integer number (4197466).

Almost surely, 2^16697431 is an apocalyptic number.

16697431 is a deficient number, since it is larger than the sum of its proper divisors (92433).

16697431 is an equidigital number, since it uses as much as digits as its factorization.

16697431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92432.

The product of its digits is 27216, while the sum is 37.

The square root of 16697431 is about 4086.2490134597. The cubic root of 16697431 is about 255.5935475198.

The spelling of 16697431 in words is "sixteen million, six hundred ninety-seven thousand, four hundred thirty-one".